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Guide for Interworking Between HUAWEI CloudFabric Solution and Redhat OpenStack

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Red Hat OpenStack Undercloud

Red Hat OpenStack Undercloud

The Undercloud is the main director node. It is a single-system OpenStack installation that includes components for provisioning and managing the OpenStack nodes that form your OpenStack environment (the Overcloud). The Undercloud components provide the following functions:

  • Environment planning: The Undercloud provides planning functions for users to assign Red Hat Enterprise Linux OpenStack Platform roles, including Compute, Controller, and various storage roles.
  • Bare metal system control: The Undercloud uses the Intelligent Platform Management Interface (IPMI) of each node for power management control and a PXE-based service to discover hardware attributes and install OpenStack to each node. This provides a method to provision bare metal systems as OpenStack nodes.
  • Orchestration: The Undercloud provides and reads a set of YAML templates to create an OpenStack environment.

The Red Hat Enterprise Linux OpenStack Platform director utilizes these Undercloud functions through a terminal-based command line interface (CLI). The Undercloud includes the following components:

  • OpenStack Bare Metal (Ironic) and OpenStack Compute (Nova): manage bare metal nodes.
  • OpenStack Networking (Neutron) and Open vSwitch: control networking for bare metal nodes.
  • OpenStack Image Server (Glance): stores images that are written to bare metal machines.
  • OpenStack Orchestration (Heat) and Puppet: provides orchestration of nodes and configuration of nodes after the director writes the Overcloud image to a disk.
  • OpenStack Telemetry (Ceilometer): monitors and collects data.
  • OpenStack Telemetry Metrics (Gnocchi): provides a time sequence database for metrics.
  • OpenStack Telemetry Alarming (Aodh): reports alarms based on monitoring.
  • OpenStack Identity (Keystone): authenticates and authorizes the director's components.
  • MariaDB: functions as the database for the director.
  • RabbitMQ: functions as a messaging queue for the director's components.
Updated: 2019-03-25

Document ID: EDOC1100072313

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